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Construction and Installation Technology of Tensioned Membrane Structures

Date: 2022-03-29 Author: 科琦气膜

  材料

  1.膜材料

  目前,用于张力膜结构的膜材料有两类:一类是玻璃纤维织物聚四氟乙烯涂层(俗称PE膜),使用寿命长,价格高,在我国很少使用。另一种是高强度聚酯织物PVC涂层(俗称PVC膜),使用寿命相对较短,价格适中,在我国应用广泛。这类材料的特性必须满足:低弹性、高强度聚酯织物双面PVC涂层;在长期应力下基本上没有蠕变;抗拉强度(经向):>400014000N/5cm;重量:>950g/m2;厚度>0,

  8mm;彩色透明材料透光率:10%~20%;涂有防污自洁涂层:Tedlar或100%PVDF;阻燃B1级;耐腐蚀性;抗静电;适用温度范围:-30℃~70℃;良好的水密性和气密性;使用寿命:&Ge;15年。

  2.钢丝绳

  张力膜结构钢缆可采用无油镀锌钢丝绳或保护套(平行钢丝束加保护套)、锻钢或接头、锌铜合金或环氧铁砂铸件等连接

  (1) 铸钢件应进行超声波探伤,

  其质量应符合《铸钢件超声波探伤及质量评定标准》加工技术要求中Ⅲ级的有关规定。相同规格的热浇铸摊铺机的相同部件应可互换。锚的表面应镀锌,镀锌厚度应为10~30gmo锌铜合金铸造材料(Zn;(98±0.2)%,Cu:(2±0.2)%)。

  (2) 成品钢缆制造技术要求。

  (1) 扭转。钢丝束应向左同心缠绕,结构紧凑,最外层钢丝的捻角为3°±0.5°,

  针距应符合绞合要求。

  (2) 包裹。钢丝外缠缠绕带,单层重叠宽度应小于带宽的1/3,缠绕层应紧密整齐,

  没有暴露和损坏。

  (3) 成品钢丝绳的长度。根据张拉膜结构体系预应力状态下每根钢索的内力值控制,应力下料应满足设计长度的要求。允许误差为电缆长度L≤100米时,长度误差为△ L≤土壤10mm,平面长度L>什么时候△ 长度=&100毫升;0.000Imm。如果设计要求,

  在受力状态下,应清楚标记电缆的相应位置。

  (4) 安装连接器。接头应采用热铸造工艺组装,合金铸造率应为≥92%,保证了相应考核技术指标的要求。钢缆与接头的连接应采取特殊措施,以确保密封。成品钢丝绳中心与接头端面之间的垂直度为90度plusmn;0.5°铸件主体的大端需要为&Ge;顶部压力为标称断裂载荷(P)的0.4倍,保持载荷5分钟

  (5) 成品钢丝绳应能弯曲和缠绕,

  最小缠绕直径不得小于钢丝绳直径的17倍。静载荷破坏载荷(P)≥0.95p1,拉伸弹性模量(E)和ge;1.9倍;103MPa

  (6) 在接头侧面标记元件的编号和规格。每根成品钢丝绳应悬挂合格证,合格证上应注明:制造商名称、项目名称、生产日期、钢丝绳编号、规格、长度和重量。证书标签应牢固地系在包装层两端的接缝上。



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